Finding the Fourth Proportional to 622,086.72, 932,003.64 and 285,408.96

Step by Step Solution

1. Step 1: Write the proportion equation
   622,086.72 : 932,003.64 = 285,408.96 : x
2. Step 2: Convert to fraction form
   622,086.72/932,003.64 = 285,408.96/x
3. Step 3: Cross multiply
   622,086.72x = 932,003.64 × 285,408.96
4. Step 4: Simplify right side
   622,086.72x = 266,002,189,608.61
5. Step 5: Solve for x
   x = 266,002,189,608.61/622,086.72
6. Step 6: Final answer
   x = 427,596.64